Tmo and Moto X

I'm a lil fuzzy on this. I know that T-Mobile said they were not directly selling the Moto X. When the exclusive with AT&T and Moto Maker expires . Should I be able to use the Moto Maker site to get a custom X that would be set for T-Mobile? By that I'm not saying unlocked though that would be great. I mean so that things like wireless calling can be done with it.

Right now I can do this with my play store Gnex. That said it's not baked in and I have to use a third party app like talk tone to do that.